Determine surface area associated with each particle

[patkins]

As we expand methods for analyzing data at the particle level (i.e. scalar feature data), it will be necessary to have methods to evaluate the surface area associated with each particle, such that users can quantify the specific region associated with observed differences.

[HeavenlyBerserker]

@akenmorris Shireen and I agreed to unassign myself and put it in "nice to have." Please reassign accordingly in the future.